Question

所以我尝试使用进度条直观地显示通过ftp上传文件的进度。我似乎无法弄清楚为什么，进度条和其他3个标签（labelSpeed，labelPerc，labelUploaded）无效。

非常感谢任何帮助。感谢。

PS：我附上了我的代码snipet供查看。

Stopwatch sw = new Stopwatch(); //<-- The stopwatch which we will be using to calculate the upload speed

public void Upload(string ftpServer, string username, string password, string filename, string folder1, string folder2, string folder3)//<-- Uploads image to ftp directory
    {
        string ftpfolderpath = folder1 + "/" + folder2 + "/" + folder3;
        MakeFTPDir(ftpServer, ftpfolderpath, username, password); //<-- Makes the new directory, if there isnt one already

        using (WebClient client = new WebClient())
        {
            client.UploadFileCompleted += new UploadFileCompletedEventHandler(Completed); //<--NEW
            client.UploadProgressChanged += new UploadProgressChangedEventHandler(ProgressChanged); //<--NEW
            sw.Start(); //<-- Start the stopwatch which we will be using to calculate the upload speed

            client.Credentials = new NetworkCredential(username, password);
            client.UploadFile(ftpServer + "/" + folder1 + "/" + folder2 + "/" + folder3 + "/" + new FileInfo(filename).Name, "STOR", filename); //<-- uploads image to ftp Directory
        }
    }

    private void ProgressChanged(object sender, UploadProgressChangedEventArgs e) //<-- The event that will fire whenever the progress of the WebClient is changed
    {
        // Calculate upload speed and output it to labelSpeed.
        labelSpeed.Text = string.Format("{0} kb/s", (e.BytesSent / 1024d / sw.Elapsed.TotalSeconds).ToString("0.00"));

        // Update the progressbar percentage only when the value is not the same.
        progressBar1.Value = e.ProgressPercentage;

        // Show the percentage on our label.
        labelPerc.Text = e.ProgressPercentage.ToString() + "%";

        // Update the label with how much data have been uploaded so far and the total size of the file we are currently uploading
        labelUploaded.Text = string.Format("{0} MB's / {1} MB's",
            (e.BytesSent / 1024d / 1024d).ToString("0.00"),
            (e.TotalBytesToSend / 1024d / 1024d).ToString("0.00"));
    }

    private void Completed(object sender, UploadFileCompletedEventArgs e) //<-- The event that will trigger when the WebClient is completed
    {
        if (e.Error != null)
        {
            string error = e.Error.ToString(); // error = "Custom error message here";
            MessageBox.Show(error);
            return;
        }

        sw.Reset(); // Reset the stopwatch.

        if (e.Cancelled == true)
        {
            MessageBox.Show("Image Upload has been canceled.");
        }
        else
        {
            MessageBox.Show("Image Upload completed!");
        }
    }

Answer 1

您正在使用阻止调用UI线程的UploadFile方法。相反，在GUI线程上，应该使用UploadFileAsync来阻止。

可以看到类似WebClient.UploadProgressChanged Event (System.Net)

的示例

编辑：：这就是我的意思。替换

client.UploadFile(ftpServer + "/" + folder1 + "/" + folder2 + "/" + folder3 + "/" + new FileInfo(filename).Name, "STOR", filename); //<-- uploads image to ftp Directory

带

client.UploadFileAsync(new Uri(ftpServer + "/" + folder1 + "/" + folder2 + "/" + folder3 + "/" + new FileInfo(filename).Name), "STOR", filename); //<-- uploads image to ftp Directory

使用进度条跟踪ftp领域上传的问题

1 个答案: